stress ratio

stress ratio

[′stres ‚rā·shō]
(mechanics)
The ratio of minimum to maximum stress in fatigue testing, considering tensile stresses as positive and compressive stresses as negative.
References in periodicals archive ?
The fatigue tests of notched specimens were carried out at R = -1 and the fatigue tests of smooth specimens were carried out at three different values of stress ratio R(R = -1, 0.
A numerical analysis of reinforced concrete columns subjected to high-cycle fatigue loading has shown that the resistant number of cycles, next to well established parameters such as maximum stress level, stress ratio and loading frequency, is greatly affected by reinforcement ratio.
Embedded in the seismic utilities module, these tools calculate volumes of properties such as Young s Modulus, Brittleness and Closure Stress Ratio from pre-stack inversion results.
The samples tested at the stress amplitude of 85 MPa and stress ratio R = -1 had coarse unmodified microstructures and large silicon and iron-rich particles.
The results are presented here in terms of the number of load cycles to liquefaction in response to the cyclic stress ratio (CSR).
The FCGR in Region 2 is governed mainly by crack tip stress intensity levels, but can be affected by testing variables such as stress ratio (R = [K.
Further fatigue tests are planed with a stress ratio of R = -1.
Results of stress ratio analyses suggested that the ratio of material modulus of rupture (MOR) to the fatigue stress level required to be achieved for design of upholstered furniture frame members considering stepped fatigue effects could be set to 1.
L] = number of loading cycles required to produce initial liquefaction corresponding to the cyclic stress ratio, CSR (=cyclic stress required to initiate liquefaction / vertical effective stress in soil) and [theta] = constant representing soil properties and test condition (commonly, [theta]=0.